Compensation in Addition and Subtraction

83 - 45 = 

• 38

• 42

• 128

• 37

How would you rearrange this to find the missing number?

• 9 - 15 = ?

• ? - 9 = 15

• 15 - 9 = ?

• 9 + 15 = ?

What equation can be used to check 819 - 298 = 521?

• 521 + 819 = 298

• 298 + 819 = 521

• 298 - 819 = 521

• 521 + 298 = 819

Solve:
246 + 553 = ?

• 313

• 799

• 809

• 307

Jordan read 485 pages last month and 391 pages this month. How many pages did Jordan read altogether?

• 866 pages

• 876 pages

• 886 pages

• 877 pages

James have 90 marshmallows in the jar. He adds 382 more. How many marshmallows are now in the jar? 

• 472

• 289

• 340

• 198

Find the sum of 12908; 456; 7843

516 + 468 =

• 974

• 1,984

• 984

• 986

Use mental math to solve.

120 + 42 + 80

81+18=

• 99

• 90

• 88

• 77